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authorAndrew Duda <aduda@meraki.com>2016-11-08 18:53:40 +0000
committerTom Rini <trini@konsulko.com>2016-11-21 14:07:30 -0500
commitda29f2991d75fc8aa3289407a0e686a4a22f8c9e (patch)
tree3c972878a859196e72be31fe6da6d0ae5047d38b /include/u-boot/sha1.h
parent5300a4f9336291fb713fcfaf9ea6e51b71824800 (diff)
rsa: Verify RSA padding programatically
Padding verification was done against static SHA/RSA pair arrays which take up a lot of static memory, are mostly 0xff, and cannot be reused for additional SHA/RSA pairings. The padding can be easily computed according to PKCS#1v2.1 as: EM = 0x00 || 0x01 || PS || 0x00 || T where PS is (emLen - tLen - 3) octets of 0xff and T is DER encoding of the hash. Store DER prefix in checksum_algo and create rsa_verify_padding function to handle verification of a message for any SHA/RSA pairing. Signed-off-by: Andrew Duda <aduda@meraki.com> Signed-off-by: aduda <aduda@meraki.com> Reviewed-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'include/u-boot/sha1.h')
-rw-r--r--include/u-boot/sha1.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/u-boot/sha1.h b/include/u-boot/sha1.h
index b0d9ce9db9..2634a29c20 100644
--- a/include/u-boot/sha1.h
+++ b/include/u-boot/sha1.h
@@ -21,6 +21,9 @@ extern "C" {
#define SHA1_SUM_POS -0x20
#define SHA1_SUM_LEN 20
+#define SHA1_DER_LEN 15
+
+extern const uint8_t sha1_der_prefix[];
/**
* \brief SHA-1 context structure